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Comparison of erosion and deposition in JET divertor during the first three ITER-like wall campaigns
Natl Res Nucl Univ MEPhI, Moscow, Russia.;Max Planck Inst Plasma Phys, Garching, Germany..
Max Planck Inst Plasma Phys, Garching, Germany..
Culham Sci Ctr, Culham Ctr Fus Energy, Abingdon, Oxon, England..
Forschungszentrum Julich, Julich, Germany..
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2020 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T171, no 1, article id 014059Article in journal (Refereed) Published
Abstract [en]

The manuscript presents an overview of the erosion and deposition data in the inner and outer JET divertor observed during the first three ITER-like wall campaigns (JET-ILW1, JET-ILW2, JET-ILW3). Erosion and deposition were studied using core samples cut out from divertor tiles. For the studied samples a similar general deposition pattern was observed in all three campaigns: More than 60% of the total deposition occurred in the upper region of the inner divertor on tiles 0 and 1, where Be was transported and deposited from the scrape-off layer. High erosion was observed only on tile 5. In JET-ILW2 and 3, erosion together with high power fluxes was observed in the outer divertor at the bottom of tile 7. Additionally, deposition peaks were observed on the sloping parts of tiles 4 and 6, which were more pronounced in JET-ILW2 and 3 due to placing the strike point more often on these tiles. The deposits consisted primarily of Be, with some additional D and C. Deposition rates were observed to decrease from campaign to campaign, with the C deposition rate decreasing the most, more than 2 times from JET-ILW1 to JET-ILW3. D retention up to levels of similar to 1 at% was observed up to large depths in the W protective coatings in all campaigns.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2020. Vol. T171, no 1, article id 014059
Keywords [en]
erosion, deposition, hydrogen accumulation, JET-ILW, tungsten, beryllium, ion beam analysis
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-271957DOI: 10.1088/1402-4896/ab5c11ISI: 000520000600059Scopus ID: 2-s2.0-85084653144OAI: oai:DiVA.org:kth-271957DiVA, id: diva2:1423597
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QC 20200415

Available from: 2020-04-15 Created: 2020-04-15 Last updated: 2020-05-25Bibliographically approved

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